History of the DQHDS

• installed in 2005/6
• all removed during LS1 12/13
• put back in random places

• same story but in LS2

• • maybe not in eam - but on confluence - https://confluence.cern.ch/display/TEE/History+of+DQHDSs+problems
  • eam hcdypb
    • not sure if HDS1,2,3 or 4
  • 6000 installed in tunnel and service area
  • 1332 dipole with 4 hds
  • 392 mq with 2 hds
  • only since 2019 have up to date data
• what is b1 and b2?
  • have a file to relate which one it is
  • 99% of ipq stayed in tunnel
  • sometimes could be moved (LS/TS)
  • have voltage divider based on four resistor
  • 5% tolerance
  • whole chain of data transmission
    •  
  • for dipole 1-4
  • for ipq it is also related to beam
  • voltage measurement
• radiation levels
  • MBs after LS1 & MQs after LS2
  • HL LHC https://edms.cern.ch/ui/file/2302154/1.0/HLLHC_Specification_Document_v1.0.pdf
  • Edward sends equivalent document for run 3
• during LS3 new DQHDS come in in IPQ
  • is HL version also going in IT
  • old ones will be used as spares